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3 results for “ventral furrow”
Data from: Mechanical feedback and robustness of apical constrictions in Drosophila embryo ventral furrow formation
<p>Formation of the ventral furrow in the Drosophila embryo relies on the apical constriction of cells in the ventral region to produce bending forces that drive tissue invagination. Recently [J Phys Condens Matter. 2016;28(41):414021], we observed that apical constrictions during the initial phase of ventral furrow formation produce elongated patterns of cellular constriction chains prior to invagination, and argued that these are indicative of tensile stress feedback. Here, we quantitatively analyze the constriction patterns preceding ventral furrow formation and find that they are consistent with the predictions of our active-granular-fluid model of a monolayer of mechanically coupled stress-sensitive constricting particles. Our model shows that tensile feedback causes constriction chains to develop along underlying precursor tensile stress chains that gradually strengthen with subsequent cellular constrictions. As seen in both our model and available optogenetic experiments, this mechanism allows constriction chains to penetrate or circumvent zones of reduced cell contractility, thus increasing the robustness of ventral furrow formation to spatial variation of cell contractility by rescuing cellular constrictions in the disrupted regions.</p>
Data from: Mechanical feedback and robustness of apical constrictions in Drosophila embryo ventral furrow formation
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and metatarsal trichobothria as well as the bristles and the tibial and metatarsal bristleshaped hairs are drawn but no normal hairs; 6) retrolateral aspect of the left retroclaw IV; 7) genital area in front of the epigastral furrow in which no epiandrous gland spigots are recognizable. Not all of the hairs anteriorly of the pit are drawn; 8) outline of the anterior spinnerets, ventral aspect; 9) retrolateral aspect of the right pedipalpus; 10) prolateral aspect of the right pedipalpus. Only two of the long retrolateral bristle-shaped cymbial hairs are drawn; 11) ventral aspect of the right pedipalpus; 12) slightly different retroventral aspects of the distal part of the right pedipalpus. C = conductor, E = embolus, M = median apophysis, O = proventral-distal outgrowth of the pedipalpal tibia. Scale bars 0.5 mm in figs. 1-2 and 5, 0.05 in fig. 4 and 6, 0.1 in fig. 7, 0.2 in the remaining figs; in On European Spiders Of The Nominal Families Liocranidae, Miturgidae And Zoridae (Araneae), With Descriptions Of New Taxa
and metatarsal trichobothria as well as the bristles and the tibial and metatarsal bristleshaped hairs are drawn but no normal hairs; 6) retrolateral aspect of the left retroclaw IV; 7) genital area in front of the epigastral furrow in which no epiandrous gland spigots are recognizable. Not all of the hairs anteriorly of the pit are drawn; 8) outline of the anterior spinnerets, ventral aspect; 9) retrolateral aspect of the right pedipalpus; 10) prolateral aspect of the right pedipalpus. Only two of the long retrolateral bristle-shaped cymbial hairs are drawn; 11) ventral aspect of the right pedipalpus; 12) slightly different retroventral aspects of the distal part of the right pedipalpus. C = conductor, E = embolus, M = median apophysis, O = proventral-distal outgrowth of the pedipalpal tibia. Scale bars 0.5 mm in figs. 1-2 and 5, 0.05 in fig. 4 and 6, 0.1 in fig. 7, 0.2 in the remaining figs;
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